Learn English Through Story Patenting the Sun or History of the Vaccine.

Improve your listening skills and learn to understand the speech of native English speakers. Learn useful vocabulary and phrases of everyday English. Although the disease appeared long ago and was discovered in ancient Egypt, by the middle of the last century, polio epidemics had become a nightmare for parents and authorities in the United States, Europe, Asia and Africa. Today, this disease is remembered in connection with the vaccination for children. Anyway, few people know the names of the scientists who created the vaccines that beat the disease and abandoned patenting, although they could have made millions of dollars. The scientists who donated their vaccine to humanity are named Jonas Salk and Albert Sabin. *** Spoken English self-study coursebook =olp_product_details *** Join Perfect English Pronunciation Online Course Find Lingportal here: Web: FB: Instagram: Subscribe on YouTube: #lingportal, #learnenglishthroughstory, #listeningpractice, #elonmusk, #listeningenglish, #listeningskills, #learnenglish, #englishlanguage, #studyenglish,